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Problems with Arpspoof

First let me state its 4:30am and im working on my 2nd 2liter of Mt Dew so if i miss spell somthing or im unclear im sorry.
Im working with the latest copy of backtrack and experimenting on my own network. Back track is running on a laptop that is connected via ath0 to a wrt54g that is the dhcp/gateway. from that gateway a wire runs to a 10/100/100 netgear 5 port switch and my desktop is connected to that running winder$ xp (no thats not a spelling mistake)

Im trying to arp spoof the network so i can understand how to MITM Https for a paper i am writing for school on network security.

My network is based on the 192.168.1.1
255.255.255.0 subnet

If i type
arpspoof -t 192.168.1.106 192.168.1.101
.106 = windows box
.101 = backtrack
I get an error
that says it "couldn't arp for host"
I did a search and all i found was somthign saying i was trying to spoof on a differnt subnet even though im not. If i used Eithercap every thing works fine....
Any ideas? Thank you -TheX1le

...."Cant stop the signal Mel, Every thing goes some where and i go every where."...... "From here to the eyes and the ears of the verse, thats my motto or might be if i start having a motto" - Mr. Universe "Serenity"

Are you saying i need to do that even if i use the -i Switch? that lets you pick which interface to run on. and also was i correct in my thinking that fragrouter is forwarding all traffic? Thank you for all your help.

Ok so i have spent the last half hour messing with this. Im running this on a 3 year old Alienware notebook with a 2.8ht p4. and useing a wag511 Netgear wifi card. If i run eithercap with an arp attack every thing works great i have snarfed all my passwords. Im running Backtrack and the -V of Dsniff is 2.4 Now i went to the authors site and the latest edition is 2.3 but he has a 2.4b1 beta I think that this is what they are useing. I downloaded the beta and made the changes you suggested how ever make throws an error dealing with arpspoof. I contemplated piping it to a file but i didnt think of it till afterwards. Im thinking that its a problem with the wifi. I dont have a nic on this computer its broken so im gonna try to scare up a pcimcia nic to test it out. I tried it on a friends network his is 192.168.50.1 and it was odd it just kept dispaying the syntax like it didnt like the .50 octect. Any ideas where im going wrong? Im thinking it may be a problem with the program its self. Thanks LinuxComando

...."Cant stop the signal Mel, Every thing goes some where and i go every where."...... "From here to the eyes and the ears of the verse, thats my motto or might be if i start having a motto" - Mr. Universe "Serenity"